All Stories

  1. Machine learning for dissolved oxygen prediction in the Manawatu River catchment, New Zealand

    Article • Water Practice & Technology, September 2025, IWA Publishing

    Nkpa Ogarekpe

  2. Effects of Water Storage Materials on the Quality of Roof-Harvested Rainwater

    Article • Water Conservation Science and Engineering, August 2025, Springer Science + Business Media

    Nkpa Ogarekpe , Prof. Maurice George Ekpenyong

  3. Waste stabilization pond modelling using extreme gradient boosting machines

    Article • Water Practice & Technology, November 2024, IWA Publishing

    Nkpa Ogarekpe

  4. Detection and Measurement of Bacterial Contaminants in Stored River Water Consumed in Ekpoma

    Article • Water, September 2024, MDPI AG

    Nkpa Ogarekpe

  5. Hydrological and Morphometric Characterization of Anambra-Imo River Basin Using Remote Sensing

    Article • Water Conservation Science and Engineering, May 2024, Springer Science + Business Media

    Nkpa Ogarekpe

  6. Process analysis and optimization of solid waste haulage in Enugu Metropolis

    Article • Journal of Material Cycles and Waste Management, December 2023, Springer Science + Business Media

    Nkpa Ogarekpe

  7. Comparative Assessment of Medical Waste Management in Multi-System and Selected Teaching Hospitals in Ekiti State, Nigeria

    Article • Nature Environment and Pollution Technology, June 2023, Technoscience Publications

    Nkpa Ogarekpe

  8. Bacterial Contamination Levels and Brand Perception of Sachet Water: A Case Study in Some Nigerian Urban Neighborhoods

    Article • Water, May 2023, MDPI AG

    Nkpa Ogarekpe

  9. Groundwater quality index and potential human health risk assessment of heavy metals in water: A case study of Calabar metropolis, Nigeria

    Article • Environmental Nanotechnology Monitoring & Management, May 2023, Elsevier

    Nkpa Ogarekpe , Prof. Maurice George Ekpenyong

  10. Stochastic modeling and meta-heuristic multivariate optimization of bioprocess conditions for co-valorization of feather and waste frying oil toward prodigiosin production

    Article • Preparative Biochemistry & Biotechnology, October 2022, Taylor & Francis

    Nkpa Ogarekpe , Prof. Maurice George Ekpenyong

  11. Intracellular-to-extracellular localization switch of acidic lipase in Enterobacter cloacae through multi-objective medium optimization: aqueous two-phase purification and activity kinetics

    Article • World Journal of Microbiology and Biotechnology, October 2022, Springer Science + Business Media

    Nkpa Ogarekpe , Prof. Maurice George Ekpenyong

  12. Flash Flood Risk Assessment of the Great Kwa River Basin Using Analytical Hierarchy Process

    Article • Water Conservation Science and Engineering, October 2022, Springer Science + Business Media

    Nkpa Ogarekpe , Prof. Maurice George Ekpenyong

  13. Assessing the state of rainwater for consumption in a community in dire need of clean water: Human and health risk using HERisk

    Article • Water Practice & Technology, September 2022, IWA Publishing

    Nkpa Ogarekpe

  14. Overproduction of a thermo-stable halo-alkaline protease on agro-waste-based optimized medium through alternate combinatorial random mutagenesis of Stenotrophomonas acidaminiphila

    Article • Biotechnology Reports, September 2022, Elsevier

    Prof. Maurice George Ekpenyong, Nkpa Ogarekpe

  15. Intracellular-to-extracellular localization switch of acidic lipase in Enterobacter cloacae: evaluation of production kinetics and enantioselective esterification potential for pharmaceutical applications

    Article • Preparative Biochemistry & Biotechnology, August 2022, Taylor & Francis

    Prof. Maurice George Ekpenyong, Nkpa Ogarekpe

  16. A novel strain of Stenotrophomonas acidaminiphila produces thermostable alkaline peptidase on agro-industrial wastes: process optimization, kinetic modeling and scale-up

    Article • Archives of Microbiology, June 2022, Springer Science + Business Media

    Prof. Maurice George Ekpenyong, Nkpa Ogarekpe

  17. A preliminary case for modification of the SCS-CN hydrologic model for runoff prediction in Imo River sub-basin

    Article • Arabian Journal of Geosciences, April 2022, Springer Science + Business Media

    Nkpa Ogarekpe

  18. Dimensionality Reduction Analysis of the Integrated Solar and Hydraulic Jump Enhanced Waste Stabilization Pond Model Parameters

    Article • International Journal of Engineering Research in Africa, January 2022, Trans Tech Publications

    Nkpa Ogarekpe , Prof. Maurice George Ekpenyong

  19. Biomedical Waste Management Practices in Sub-Saharan Africa: Insights of Its Impacts and Strategies for Its Mitigation

    Article • January 2022, Springer Science + Business Media

    Nkpa Ogarekpe

  20. Temporal and spatial dynamics of land use and land cover changes in derived savannah hydrological basin of Enugu State, Nigeria

    Article • Environment Development and Sustainability, September 2021, Springer Science + Business Media

    Nkpa Ogarekpe

  21. Kinetic modeling and quasi-economic analysis of fermentative glycolipopeptide biosurfactant production in a medium co-optimized by statistical and neural network approaches

    Article • Preparative Biochemistry & Biotechnology, April 2021, Taylor & Francis

    Nkpa Ogarekpe , Prof. Maurice George Ekpenyong

  22. Equilibrium and thermodynamic investigation of biosorption of nickel from water by activated carbon made from palm kernel chaff

    Article • Scientific Reports, April 2021, Springer Science + Business Media

    Nkpa Ogarekpe

  23. Bioprocess Optimization of Nutritional Parameters for Enhanced Anti-leukemic L-Asparaginase Production by Aspergillus candidus UCCM 00117: A Sequential Statistical Approach

    Article • International Journal of Peptide Research and Therapeutics, March 2021, Springer Science + Business Media

    Prof. Maurice George Ekpenyong, Nkpa Ogarekpe

  24. Bacterial characterization and quantification of rainwater harvested in a rural community in Nigeria

    Article • Environmental Nanotechnology Monitoring & Management, October 2020, Elsevier

    Nkpa Ogarekpe

  25. Assessment of regional best-fit probability density function of annual maximum rainfall using CFSR precipitation data

    Article • Journal of Earth System Science, August 2020, Springer Science + Business Media

    Nkpa Ogarekpe

  26. Statistical and Artificial Neural Network Approaches to Modeling and Optimization of Fermentation Conditions for Production of a Surface/Bioactive Glyco-lipo-peptide

    Article • International Journal of Peptide Research and Therapeutics, July 2020, Springer Science + Business Media

    Nkpa Ogarekpe , Prof. Maurice George Ekpenyong

  27. A dataset for the flood vulnerability assessment of upper Cross River basin using morphometric analysis

    Article • Data in Brief, February 2020, Elsevier

    Nkpa Ogarekpe

  28. Flood vulnerability assessment of the upper Cross River basin using morphometric analysis

    Article • Geomatics Natural Hazards and Risk, January 2020, Taylor & Francis

    Nkpa Ogarekpe

  29. Probabilistic risk assessment and spatial distribution of potentially toxic elements in groundwater sources in Southwestern Nigeria

    Article • Scientific Reports, November 2019, Springer Science + Business Media

    Nkpa Ogarekpe

  30. Comparison of predicted annual maximum rainfall for Calabar metropolis using statistical approach

    Article • International Journal of Hydrology, October 2019, MedCrave Group LLC

    Nkpa Ogarekpe

  31. Preliminary assessment of the suitability of commonly used antiseptics in the elimination of bacteria in bathing water

    Article • Environmental Monitoring and Assessment, May 2019, Springer Science + Business Media

    Nkpa Ogarekpe

  32. Preliminary investigation on the use of Moringa oleifera for the purification of lead polluted wastewater

    Article • Nigerian Journal of Technology, January 2019, African Journals Online (AJOL)

    Nkpa Ogarekpe

  33. Evaluation of rate constant models on the performance of the integrated solar and hydraulic jump enhanced waste stabilization pond using quantitative statistics approach

    Article • January 2018, Desalination Publications

    Nkpa Ogarekpe

  34. Application of Seismic Sequence Stratigraphy to Exploitation of Oil and Gas in “X” Field of Niger Delta-Nigeria

    Article • International Journal of Engineering and Technology, June 2017, ENGG Journals Publications

    Nkpa Ogarekpe

  35. PREDICTING DEGRADATION WITH BIOCHEMICAL OXYGEN DEMAND IN DISINFECTANT-POLLUTED SEWAGE

    Article • June 2017, WITPRESS LTD.

    Nkpa Ogarekpe

  36. Effect of geometry on the performance of integrated solar and hydraulic jump enhanced waste stabilization pond

    Article • Desalination and Water Treatment, February 2016, Taylor & Francis

    Nkpa Ogarekpe

  37. Sensitivity analysis of model parameters on biochemical oxygen demand in integrated solar and hydraulic jump enhanced waste stabilization pond

    Article • Desalination and Water Treatment, November 2015, Taylor & Francis

    Nkpa Ogarekpe

  38. A new model for the prediction of the performance of integrated solar and hydraulic jump enhanced waste stabilization pond

    Article • Desalination and Water Treatment, June 2015, Taylor & Francis

    Nkpa Ogarekpe

  39. Rainfall Runoff Model for Calabar Metropolis Using Multiple Regression

    Article • Nigerian Journal of Technology, September 2014, African Journals Online (AJOL)

    Nkpa Ogarekpe

  40. Development and comparison of different intensity duration frequency models for Calabar, Nigeria

    Article • Nigerian Journal of Technology, February 2014, African Journals Online (AJOL)

    Nkpa Ogarekpe

  41. The Effect of Hydraulic Jump on the Performance of Waste Stabilization Ponds

    Article • Hydrology Current Research, January 2010, OMICS Publishing Group

    Nkpa Ogarekpe